- 98% satisfied customers
- 72h delivery
- 30 dni na zwrot
Carbide insert 22 ER N55 HTA Horn
€12.95 tax inc.
Net price: €10.53
Description
22 ER N55 inch threading insert – universal 55° profile
Technical data for the partial-profile insert for threads from 7 to 5 threads per inch
| Technical data | |
|---|---|
| Designation | 22 ER N55 HTA |
| Type | external threading insert, right-hand |
| Profile | partial (incomplete), 55° angle |
| Threads per inch | 7–5 |
| Pitch range | 3.63–5.08 mm |
| Corner radius | 0.43 mm |
| Insert size | 22: edge 22 mm, IC 12.7 mm |
| Cutting edges | 3 |
| Tool holders | right-hand external SER, size 22, alternatively left-hand internal SIL 22 |
| Grade | HTA: submicron carbide, PVD TiAlN |
Thread angle55°
Pitch range3.63–5.08 mm
Threads per inch7–5
Tool holdersSER 22
22 ER N55 inch threading insert turns external threads with a 55° profile angle and 7 to 5 threads per inch. A single insert can cut BSW Whitworth threads within this range. It operates in size 22 right-hand SER holders and, alternatively, in left-hand SIL 22 boring bars. It has three corners: when a cutting edge wears out, index the insert to the next corner.
How the 22 ER N55 insert cuts threads – rotation, feed and passes
Feed equal to the pitch and several progressively shallower passes
Schematic illustration: insert in a right-hand SER holder in front of the lathe axis. Gold highlights the insert.
One spindle revolution – one thread pitch
The shaft rotates while the insert in the holder moves along its axis. The travel per spindle revolution is exactly one pitch, e.g., 3.629 mm for a BSW 1 1/8" thread. In a typical setup, the right-hand insert feeds toward the chuck and cuts a right-hand thread.
The N55 insert does not touch the thread crests. They retain the diameter turned before threading, so this dimension determines the finished thread.
Schematic illustration of passes for a BSW 1 1/8" thread (3.629 mm pitch). Lines 1–6 show successive cutting edge positions.
Successive passes deepen the profile
A threading insert does not cut the thread in a single pass. It cuts deeper with each pass, while the thickness of material removed decreases from the first pass to the last. The final pass removes approx. 0.05–0.08 mm; a thinner layer causes the material to be compressed rather than cut.
Use flank infeed at an angle slightly less than 27.5°, which is half the profile angle. The insert then cuts mainly on one flank, and the chip flows in one direction. The rounded N55 tip penetrates deeper than the Whitworth thread root: approximately 2.40 mm instead of 2.32 mm for BSW 1 1/8". Stop the infeed when a thread ring gauge or nut fits onto the thread.
Cutting speed, spindle speed and number of passes
HTA grade is submicron carbide with a PVD TiAlN coating. It machines steels, stainless steels and cast irons. The speeds in the table apply to thread turning with this insert.
| Workpiece material | Cutting speed vc [m/min] |
|---|---|
| P Unalloyed steel, cast steel, free-cutting steel | 120–180 |
| P Low-alloy steel and cast steel (up to 5% alloying elements) | 80–130 |
| P High-alloy and tool steel | 60–80 |
| M Stainless steel and stainless cast steel | 90–130 |
| K Gray cast iron | 120–130 |
| K Ductile and malleable cast iron | 100–130 |
Select the number of passes to suit the pitch. Start in the middle of the range and add passes for harder materials.
| Threads per inch | 7 | 6 | 5 |
|---|---|---|---|
| Pitch P [mm] (equivalent) | 3.63 | 4.23 | 5.08 |
| Number of passes | 9–19 | 10–20 | 11–21 |
For 7 and 5 threads per inch, the number of passes is interpolated from the manufacturer's table.
Spindle speed and feed for BSW 1 1/8"
Pitch P is measured along the axis between corresponding points on adjacent thread turns.
For each spindle revolution, the insert advances by one pitch: fn = P = 3.629 mm/rev.
Example: BSW 1 1/8" in low-alloy steel, vc = 100 m/min
n = 1000 × vc / (π × d) = 1000 × 100 / (π × 28.575) ≈ 1110 rpm
vf = n × P = 1110 × 3.629
4028 mm/min
feed rate
d – thread diameter (28.575 mm), n – spindle speed, vc – cutting speed from the middle of the range in the table, vf – feed rate.
Universal 55° profile – from 7 to 5 threads per inch
One profile angle, many pipe and Whitworth threads
7 threads per inch – BSW 1 1/8"
6 threads per inch – BSW 1 3/8"
5 threads per inch – BSW 1 5/8"
Three threads shown at the same scale. The same insert tip cuts each groove: angle 55°, radius 0.43 mm.
The universal 55° insert has a tip radius of 0.43 mm. It fits into both a thread groove with 7 threads per inch and one with 5 threads per inch. The threads per inch are determined by the lathe feed, and the depth by the infeed over successive passes. This allows one insert to cut any 55° thread within this range.
G pipe threads according to ISO 228-1 and Whitworth threads have a 55° angle. The insert can therefore cut BSW threads from 1 1/8" to 1 5/8". For short production runs, this replaces several full-profile inserts, each of which fits a single thread count per inch.
| Threads per inch | 7 | 6 | 5 |
|---|---|---|---|
| BSW thread | 1 1/8" | 1 3/8" | 1 5/8" |
N55 vs. a full-profile insert – how they differ
Thread crest, pitch range and root radius
This insert
Partial profile 22 ER N55
The insert machines the flanks and root of the groove over a range of 7 to 5 threads per inch. It does not touch the crests: they retain the previously turned diameter.
Choose for: short runs and various pitches.
Comparison
Full profile, e.g., 22 ER 6 W
The insert cuts the flanks and the rounded root and crests of a thread with 6 threads per inch. The radii are formed in the same cycle as the flanks, ensuring a repeatable profile in production runs.
Choose for: production runs of threads with a single pitch.
| Feature | 22 ER N55 | W full profile |
|---|---|---|
| Pitch range | from 7 to 5 threads per inch | one number of threads per inch, e.g., 6 |
| Thread crest | previously turned diameter | turned together with the flanks |
| Shaft preparation | diameter to the thread specification | diameter with a small machining allowance |
| Corner radius | 0.43 mm | matches the Whitworth profile for the specified pitch |
| Groove depth for BSW 1 1/8" | approx. 2.40 mm, deeper than the Whitworth profile | 2.32 mm, matching the Whitworth profile |
| Inserts for 7–5 threads per inch | 1 | one for each pitch |
A full-profile insert finishes the thread, including the crests, making it easier to maintain a consistent profile in production runs. N55 leaves the crests at the diameter you turn. Its corner also produces a sharper thread root than the Whitworth profile.
Thread diameter and root with the N55 insert
Before threading, turn the outside diameter to the thread size, e.g., BSW 1 1/8": nominal diameter 28.575 mm. The corner radius of 0.43 mm produces a sharper root than the Whitworth profile, which rounds the root with a radius of 0.137 times the pitch (0.50 mm for BSW 1 1/8"). Where the full profile is required, select a W full-profile insert for the specific thread count.
Decoding the 22 ER N55 designation – part by part
Size, cutting hand, profile and grade in the insert designation, holder selection
Dimensions according to catalogs for inserts of this standard. Enlarged corner detail.
22 ER N55 insert dimensions
The number 22 indicates the insert size: an edge length of 22 mm and an inscribed circle IC of 12.7 mm, or 1/2 inch. It is not the thread diameter. Dimensions X = 1.7 mm and Y = 2.5 mm specify the position of the cutting tip relative to the sides of the insert. The corner has an angle of 55° and a radius of 0.43 mm.
22
Insert size
Edge 22 mm, IC 12.7 mm.
E
External thread
Turning on shafts and journals.
R
Right-hand version
SER holder, feed toward the chuck.
N55
55° partial profile
From 7 to 5 threads per inch.
HTA
Carbide grade
Submicron, PVD TiAlN, P20–P40 and K20–K30.
Mount the threading insert in right-hand SER external holders for size 22 inserts, e.g., SER 2525 M22, SER 3232 P22, or SER 4040 R22. The insert has the same shape as the left-hand internal 22 IL insert, so it can alternatively be mounted in a left-hand SIL 22 boring bar to turn an internal thread. Internal inserts are intended for regular internal threading. The standard shim tilts the insert by 1–1.5° to accommodate the thread helix angle. The shim only needs to be replaced for a large pitch on a small diameter.
The 22 ER N55 inch threading insert covers threads from 7 to 5 threads per inch with a 55° thread angle using a single cutting edge. It is useful for short production runs of various Whitworth threads. It requires a prepared diameter but eliminates the need for a separate insert for each pitch.
22 ER N55 – selection and application questions
Key information before selecting an insert
You can cut external threads with a 55° angle and 7 to 5 threads per inch: BSW Whitworth threads from 1 1/8" to 1 5/8".
Turn the outside diameter to the thread size, e.g., BSW 1 1/8": diameter 28.575 mm. The insert turns the flanks and root, while the crests remain at this diameter.
Right-hand SER external holders for size 22 inserts, e.g., SER 2525 M22, SER 3232 P22, or SER 4040 R22. It has the same shape as the left-hand internal 22 IL insert, so it also fits left-hand SIL 22 boring bars as an alternative.
The number of passes increases with pitch: 9–19 at 7 threads per inch, 10–20 at 6 threads per inch, and 11–21 at 5 threads per inch. Start at the middle of the range and add passes for harder materials. Some values were interpolated from the manufacturer's table.
This is the insert size: an edge length of 22 mm and an inscribed circle of 12.7 mm (1/2 inch). The workpiece shaft determines the thread diameter, so the 22 ER N55 insert can turn both BSW 1 1/8" and BSW 1 5/8".
Product accessories
Reviews
No customer reviews for the moment.
Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
Recommended for you
Viewed products
This website uses its own and third-party cookies to improve our services and show you advertising related to your preferences by analyzing your browsing habits. To give your consent to its use, press the Accept button.
Cookie preferences
Functional cookiesTechnical
Functional cookies are strictly necessary to provide the services of the shop, as well as for its proper functioning, so it is not possible to refuse their use. They allow the user to browse through our website and use the different options or services that exist on it.
Advertising Cookies
These are cookies that collect information about the advertisements shown to users of the website. They can be anonymous, if they only collect information about the advertising spaces shown without identifying the user, or personalised, if they collect personal information about the user of the shop by a third party, for the personalisation of these advertising spaces.
Analytics cookies
Collect information about the user's browsing experience in the shop, usually anonymously, although sometimes they also allow the user to be uniquely and unequivocally identified in order to obtain reports on the user's interests in the products or services offered by the shop.